The 21-year-old Lovato, who debuted as a child actress in the children's show "Barney & Friends" before going onto become a singer-songwriter, discussed her addiction in a revealing interview with Access Hollywood published Wednesday.

"I'm very, very good at manipulating people and that was something that I did in my disease, I would manipulate everyone around me. There were times I would just continue to lie, so that everything looked OK on the outside," Lovato told Access Hollywood.

"I couldn't go without 30 minutes to an hour without cocaine and I would bring it on airplanes," Lovato continued. "I would smuggle it basically and just wait until everyone in first class would go to sleep and I would do it right there. I'd sneak to the bathroom and I'd do it."

Lovato said she realized she had hit rock bottom at 19 years of age when she was vomiting in the back of a car on her way to the airport at 9 a.m. while clutching on to a Sprite bottle filled with vodka.

"I had a moment where I was like, 'Oh my God... that is alcoholic behavior. [It's] no longer, I'm young and rebellious and out having fun, it was, wow, I'm one of those people...I gotta get my s*** together,'" Lovato recalled.

In addition to her substance abuse, Lovato also said she suffered from an eating disorder, in which she would "compulsively" overeat, consuming entire pans of cookies, and then turn to bulimia to control her weight.

"I went from [compulsively eating and] being unhappy with my body. . . to just completely starving myself and. . . throwing up," Lovato said. "It got really difficult [and] I would throw up and it would just be blood and it was something that I realized if I don't stop this, I am going to die."

According to Lovato, who's known for such singles as "Skyscraper" and "Give Your Heart a Break," she was able to overcome her addictions and eating disorders with help from her family and a 2010 inpatient rehab stint.